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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 15/9 // - 15/9
5/y-(15/9) = 0
5/y-5/3 = 0
5*y^-1 = 5/3 // : 5
y^-1 = 1/3
-1 < 0
1/(y^1) = 1/3 // * y^1
1 = 1/3*y^1 // : 1/3
3 = y^1
y = 3
y = 3
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